str=('111',)
print(type(str))
list1=[1,2,3,4,4]
set1 = set(list1)
print(set1)
set1.pop()
print(set1)
dict1 = {1}
dict2 = {}
print(type(dict1),type(dict2))

dict3={'age',12,'name','zhangsan'}
print(dict3)
